Bianchi II with time varying constants. Self-similar approach

Abstract

We study a perfect fluid Bianchi II models with time varying constants under the self-similarity approach. In the first of the studied model, we consider that only vary $G$ and $\Lambda .$ The obtained solution is more general that the obtained one for the classical solution since it is valid for an equation of state $\omega \in (-1,\infty )$ while in the classical solution $\omega \in (-1/3,1).$ Taking into account the current observations, we conclude that $G$ must be a growing time function while $\Lambda$ is a positive decreasing function. In the second of the studied models we consider a variable speed of light (VSL). We obtain a similar solution as in the first model arriving to the conclusions that $c$ must be a growing time function if $\Lambda$ is a positive decreasing function.

10 pages. RevTeX4

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